Why a male teacher while taking class often places his hand near his eyes?

A male teacher might place his hand near his eyes for several reasons, such as to shield his eyes from bright lights or to block distractions while focusing on students or materials. It could also be a gesture of contemplation or concentration, indicating he is deep in thought. Additionally, this behavior might serve as a nonverbal cue to engage students' attention or signal a moment of significance during the lesson.